Chamfering plane



c. H. GRQT'H. l CHAMFERING PLANE. Y APPLICATION FILED IAN. I4, 1922 IMI 7 b. 8

. a A lI/IYITZVESSE'S satana* ortica.

cnantns n. onora, or nocnnsrnn, PENNSYLVANIA..

cnaarrmtiive PLANE.:

innesca'.

To all whom t may concern, i

Be it known that I, Crnimins H. GROTH, residing at Rochester, in the county of Beaver and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in Chainfering Planes, of which iniprovcinents the following is a specification.

My invention relates to chanifering planes and consists in improvements'of structure which render the instrument more eidective and easier to use.

Fig. I is a view of a chamfering planeof my invention, viewed inplan from beneath; Fig. H is a view of the plane in side elevation; and Figs. III, 1V, and V are views 4in vertical section on the planes indicated in Fig. Il by the lines III-III,

IV*IV, and V-V.

rlhe plane is an instrument for chainfering the chime of a barrel, that is tosay, cutting a bevel around the inner edgesof the assembled staves. It consists essentially of a guiding plate l, adapted when in service to extend horizontally and to overlie the ends of the assembled staves. From plate l extends downwardly a `plane with convexv sole, a, Z), the curvature of which soley corresponds in general to the curvature of the rim of the barrel. rlhe bit of the plane is indicated at 3. It is set at proper angle to the nether surface of plate l, as best shown in Figs. I 'and V, and its cutting edge is preferably raked or inclined rearwardly from lower edge to upper, as best shown in Fig. II. The plat-e l is provided with the usual handles 4 and 5, `and the ends of plate l are preferably upwardly rounded, as indicated at c and (Z. The direction in which the instrument swings to effect cutting` is indicated by arrows in Figs. I lind Il,

I direct attention to the minute shaping of` the sole of the plane. As inv all planes the block of chamfering planes now commonlyA l l Specification ot Letters Patent. I Batented Aug 15, gz Appiicationvaied-January 14,1922. l f

yserial NQ. 529,181.

in use. Asbest shown in Fig. III, itsbearing face is nearly` perpendicular in extension from the nether surfaceof plate l, indeed it is slightly inclined in opposite inclinafj tion to the face l'of the bevel ultiinate'lyciit (suiiiciently indicated Ain Fig, HI by-xthe limiting lineofthe edge of vbit 8,). `And in consequence as the instrument t advances to its work, `it istheheelof bitl3, that; is tosay. the upper and rear portion of its edge, which comes first into play, and as cutting progresses, more and more of the edge becomes effective. It is in the shaping of the posterior sole block 7 that my invention is found. Hitherto that block has,y been provided-With an iny clined face, intended to correspond in inclination with `the bevel ultimately cut. And it does so correspond when .the bevel is completed. But before completion of the bevel this part of ther sole of theplane yas hitherto constructed makes bearing only along its upper portion, adjacentthe vnether surface of plate 1. I have discovered Lherein a cause of insecurity; the instrument in service is prone to jump When 'a knot is struck, and the user is likely to have Vhis knuckles abraded on the edges ofthe staves.

My invention consists in shaping the face of this posterior block to convex curvature vertically (cf. Figs. IV and V) and in so disposing thecurve that in service thefbear- .ing of this posterior portion of thesole of the plane shall, as cutting begins and progresses, engage the work at a point remote from the nether face .of plate l. vIn consequence of this, the chamfering .plane of my invention is more secure and the user is less liable to injury of the kind mentioned.

Coordinated with this bellying of the `sole of the plane is the drooping of the handle 5. This handle ordinarily extends in substantially the plane of ,plate l. l cause it to droop, as clearly shown in Figs. II and II, and in consequence a larger component of the muscular force of the cooperis applied to holding the instrument down to the work, and in resisting occasional tendencies to juinp-as when the bit meets a knot or other hard place inthe wood.

A feature of convenience is found in making integral anterior block 6 and handle 5.

Block 6 is, as has been said, adjustable, and, byuniting handle 5 with it, the block is more readily manipulated in making adjustment. The securing bolt is `indicated at 8; adjustment by means of a slot for the passage of the bolt is too Well known to require analytic illustration. Moreover, the

feature in itself forms no part of my inven:

upon blook 7 on the side vieinote from the sole' andniade ii'itegral at one end with plate l. Beneath this bridge the bit 3 has play;

through the web of the bridge 9 a screw 10 is'eXtensible and a clamping block` ll distributes the stressof the soreW over the surfece of the bit. Thissuperior anchorage is more readily adjustable and in service is eurer than the old form alluded to.

I claim as my invention: Acharnfering plane Comprising a guiding plate to engage the edge of the stave, a

transversely convex bottomed sole block projecting from the nether surface of the plate, andiastraightie'dged ehainfering blade with an edge in Contact With the guiding plate.

In testimony whereof II have hereunto e set my hand. v

CHARLES rr. Gnorn.

niark l `Witnesses W, A. HARTZEL, M F. MoRoBERTe. 

